1858 Christiania fire

The 1858 Christiania fire, starting on 14 April 1858, severely destroyed several city blocks near Stortorvet in Christiania, Norway. 41 buildings were destroyed, and about 1,000 people lost their homes.[1]

Contents

The fire started around at one o'clock in the night, in the home of a carpenter in a wooden building within the city block west of the street Dronningens gate, the wind was blowing from the north, and within one hour five houses were set on fire. Within three hours buildings east of Dronningens gate started burning, this block had many old wooden houses, and the whole block was soon on fire and burned down completely except for one building. An important task for the firefighters was to prevent the fire from spreading southwards across the street Prinsens gate. A fire engine pump from the fortress was placed here, and the crew managed to stop it spreading further southwards. Somewhat unexpectedly the fire jumped across the wide street of Kirkegaten, some of the buildings collapsed rather quickly, and two of the firefighters perished during those events. To the east, crew from the ship Lindesnes managed to prevent the fire from crossing the street Skippergaten, after great efforts the firefighters succeeded in stopping the fire from spreading north and westwards across the streets Kongens gate and Østre gate.[2]

The city block across the street south of the bazaar halls burned down in 1858. The old firewatch building is seen behind to the left.

Eventually the whole block between the streets Prinsens gate, Kirkegaten, Østre gate and Dronningens gate was destroyed. Also nearly all buildings of the block east of Dronningens gate burned down, as well as large parts of the block west of Kirkegaten. A total of 41 buildings burned down.[3] Based on the census from 1855, the number of persons living within the destroyed area was 808. Adding an assumed extra number due to later development, it was estimated in contemporary newspaper reports that about 1,000 persons lost their homes due to the fire,[4] the number of livestock numbered to 38 horses and eight cows in 1855, and was presumed to be of the same order in 1858, although no specific report is available. Large quantities of household contents and goods had been saved from the burning houses, much of it assembled at the market place.[2]

The fire had a definite impact on decisions regarding the future of the city. Funding for a new water supply was decided four weeks after the fire, this included a new dam at Maridalsoset, the outlet of Maridalsvannet.[5] The old piping system of the city was made of linked pine logs with drilled holes, the new water pipelines were based on cast iron.[6] The old water pumps at the crossroads disappeared, and households got tap water installed. Also, the fire department of the city was eventually reorganized.[5]

1.
Stortorvet
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Stortorvet is a square in Oslo, Norway, located west of Oslo Cathedral. It was officially inaugurated during the times, in 1736. A town market was here until 1889. Marketing still exists, but has largely moved to Youngstorget. The building that houses the restaurant Stortorvets Gjæstgiveri is a Norwegian Cultural Heritage Site, the square became an important hub for public transportation with the introduction of the tramway. A balloon loop for the Ekeberg Line was located here until the 1960s, stortorvet is still served by a station on the Oslo Tramway—Stortorvet—as well as buses. The so-called Battle of the Square took place here in 1829

2.
Oslo
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Oslo is the capital and the most populous city in Norway. It constitutes both a county and a municipality, founded in the year 1040, and established as a kaupstad or trading place in 1048 by Harald Hardrada, the city was elevated to a bishopric in 1070 and a capital under Haakon V of Norway around 1300. Personal unions with Denmark from 1397 to 1523 and again from 1536 to 1814, after being destroyed by a fire in 1624, the city was moved closer to Akershus Fortress during the reign of Christian IV of Denmark and renamed Christiania in his honour. It was established as a municipality on 1 January 1838, following a spelling reform, it was known as Kristiania from 1877 to 1925, at which time its original Norwegian name was restored. Oslo is the economic and governmental centre of Norway, the city is also a hub of Norwegian trade, banking, industry and shipping. It is an important centre for industries and maritime trade in Europe. The city is home to companies within the maritime sector, some of which are among the worlds largest shipping companies, shipbrokers. Oslo is a city of the Council of Europe and the European Commission intercultural cities programme. Oslo is considered a city and ranked Beta World City in studies carried out by the Globalization and World Cities Study Group. It was ranked one in terms of quality of life among European large cities in the European Cities of the Future 2012 report by fDi magazine. A survey conducted by ECA International in 2011 placed Oslo as the second most expensive city in the world for living expenses after Tokyo. In 2013 Oslo tied with the Australian city of Melbourne as the fourth most expensive city in the world, as of January 1,2016, the municipality of Oslo has a population of 658,390, while the population of the citys urban area was 942,084. The metropolitan area had an population of 1.71 million. The population was during the early 2000 increasing at record rates and this growth stems for the most part from international immigration and related high birth rates, but also from intra-national migration. The immigrant population in the city is growing faster than the Norwegian population. As of January 1,2016, the municipality of Oslo has a population of 658,390, the urban area extends beyond the boundaries of the municipality into the surrounding county of Akershus, the total population of this agglomeration is 942,084. To the north and east, wide forested hills rise above the city giving the location the shape of a giant amphitheatre. The urban municipality of Oslo and county of Oslo are two parts of the entity, making Oslo the only city in Norway where two administrative levels are integrated

3.
Norway
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The Antarctic Peter I Island and the sub-Antarctic Bouvet Island are dependent territories and thus not considered part of the Kingdom. Norway also lays claim to a section of Antarctica known as Queen Maud Land, until 1814, the kingdom included the Faroe Islands, Greenland, and Iceland. It also included Isle of Man until 1266, Shetland and Orkney until 1468, Norway has a total area of 385,252 square kilometres and a population of 5,258,317. The country shares a long border with Sweden. Norway is bordered by Finland and Russia to the north-east, Norway has an extensive coastline, facing the North Atlantic Ocean and the Barents Sea. King Harald V of the Dano-German House of Glücksburg is the current King of Norway, erna Solberg became Prime Minister in 2013, replacing Jens Stoltenberg. A constitutional monarchy, Norway divides state power between the Parliament, the Cabinet and the Supreme Court, as determined by the 1814 Constitution, the kingdom is established as a merger of several petty kingdoms. By the traditional count from the year 872, the kingdom has existed continuously for 1,144 years, Norway has both administrative and political subdivisions on two levels, counties and municipalities. The Sámi people have an amount of self-determination and influence over traditional territories through the Sámi Parliament. Norway maintains close ties with the European Union and the United States, the country maintains a combination of market economy and a Nordic welfare model with universal health care and a comprehensive social security system. Norway has extensive reserves of petroleum, natural gas, minerals, lumber, seafood, the petroleum industry accounts for around a quarter of the countrys gross domestic product. On a per-capita basis, Norway is the worlds largest producer of oil, the country has the fourth-highest per capita income in the world on the World Bank and IMF lists. On the CIAs GDP per capita list which includes territories and some regions, from 2001 to 2006, and then again from 2009 to 2017, Norway had the highest Human Development Index ranking in the world. It also has the highest inequality-adjusted ranking, Norway ranks first on the World Happiness Report, the OECD Better Life Index, the Index of Public Integrity and the Democracy Index. Norway has two names, Noreg in Nynorsk and Norge in Bokmål. The name Norway comes from the Old English word Norðrveg mentioned in 880, meaning way or way leading to the north. In contrasting with suðrvegar southern way for Germany, and austrvegr eastern way for the Baltic, the Anglo-Saxon of Britain also referred to the kingdom of Norway in 880 as Norðmanna land. This was the area of Harald Fairhair, the first king of Norway, and because of him

4.
Carpentry
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Carpentry in the United States is almost always done by men. With 98. 5% of carpenters being male, it was the fourth most male-dominated occupation in the country in 1999, Carpenters are usually the first tradesmen on a job and the last to leave. Carpenters normally framed post-and-beam buildings until the end of the 19th century and it is also common that the skill can be learned by gaining work experience other than a formal training program, which may be the case in many places. The word carpenter is the English rendering of the Old French word carpentier which is derived from the Latin carpentrius, the Middle English and Scots word was wright, which could be used in compound forms such as wheelwright or boatwright. An easy way to envisage this is that first fix work is all that is done before plastering takes place, second fix is done after plastering takes place. Second fix work, the construction of such as skirting boards, architraves. Carpentry is also used to construct the formwork into which concrete is poured during the building of such as roads. In the UK, the skill of making timber formwork for poured, or in situ, although the. work of a carpenter and joiner are often combined. Joiner is less common than the finish carpenter or cabinetmaker. The terms housewright and barnwright were used historically, now used by carpenters who work using traditional methods. Someone who builds custom concrete formwork is a form carpenter, wood is one of mankinds oldest building materials. The ability to shape wood improved with technological advances from the age to the bronze age to the iron age. The oldest surviving, complete text is Vitruvius ten books collectively titled De architectura which discusses some carpentry. By the 16th century sawmills were coming into use in Europe, the founding of America was partly based on a desire to extract resources from the new continent including wood for use in ships and buildings in Europe. In the 18th century part of the Industrial Revolution was the invention of the steam engine and these technologies combined with the invention of the circular saw led to the development of balloon framing which was the beginning of the decline of traditional timber framing. The 19th century saw the development of engineering and distribution which allowed the development of hand-held power tools, wire nails. In the 20th century portland cement came into use and concrete foundations allowed carpenters to do away with heavy timber sills. Also, drywall came into common use replacing lime plaster on wooden lath, plywood, engineered lumber and chemically treated lumber also came into use

5.
City block
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A city block, urban block or simply block is a central element of urban planning and urban design. A city block is the smallest area that is surrounded by streets, City blocks are the space for buildings within the street pattern of a city, and form the basic unit of a citys urban fabric. City blocks may be subdivided into any number of land lots usually in private ownership, though in some cases. City blocks are usually built-up to varying degrees and thus form the physical containers or streetwalls of public space, most cities are composed of a greater or lesser variety of sizes and shapes of urban block. This arrangement is intended to provide social interaction among people. Since the spacing of streets in grid plans varies so widely among cities, or even within cities, it is difficult to generalize about the size of a city block. However, as points, the standard square blocks of Portland, Houston, and Sacramento are 264 by 264 feet,330 by 330 feet. Oblong blocks range considerably in width and length, the standard block in Manhattan is about 264 by 900 feet, and in some U. S. cities standard blocks are as wide as 660 feet. The blocks in Edmonton, Canada are 330 by 560 feet, the blocks in central Melbourne, Australia, are 330 by 660 feet, formed by splitting the square blocks in an original grid with a narrow street down the middle. Many world cities have grown by accretion over time rather than being planned from the outset, for this reason, a regular pattern of even, square or rectangular city blocks is not so common among European cities, for example. An exception is represented by those cities that were founded as Roman military settlements, one notable example is Turin, Italy. Following the example of Philadelphia, New York City adopted the Commissioners Plan of 1811 for an extensive grid plan. In much of the United States and Canada, the addressing systems follow a block and lot number system, the concept of city block can be generalized as a superblock or sub-block. Superblocks were popular during the early and mid-20th century, arising from modernist ideas in architecture, planning in this era was based upon the distance and speed scales for the automobile and discounted the pedestrian and cyclist modes, as obsolete transportation vehicles. Superblocks are often found in suburbs or planned cities, or are the result of urban renewal of the mid-20th century, in a residential area of a suburb, the interior of the superblock is typically served by dead-ended or looped streets. In this way, superblocks cut up the city into isolated units, expanded automobile dominance, superblocks can also be found in central city areas, where they are more often associated with institutional, educational, recreational and corporate rather than residential uses. The traditional urban block diffused automobile traffic onto several narrower roads at slower speeds and this more finely connected network of narrower roads better allowed the pedestrian and cyclist realms to flourish. The superblock, at the only suitable for automobiles

6.
Firefighter
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In some areas, they are also trained in Emergency Medical Services and operate ambulances in addition to being a firefighter. The fire service, or fire and rescue service, also known in countries as the fire brigade or fire department, is one of the three main emergency services. Firefighting and firefighters have become ubiquitous around the world, from wildlands to urban areas, according to Merriam-Websters Dictionary, the English word firefighter has been used since 1903. In urban areas across the world the population is protected by paid full time firefighters. The goals of firefighting are, As such, the skills required for operations are regularly practiced during training evaluations throughout a firefighters career. In the United States, the preeminent fire training and standards organization is the National Fire Protection Association, often initial firefighting skills are taught during a local, regional, or state approved fire academy. Depending on the requirements of a department, additional skills and certifications such as technical rescue, Firefighters work closely with other emergency response agencies, most particularly local and state police departments. The increasing role of firefighters in providing medical services also brings firefighters into common overlap with law enforcement. One example of this is a state law requiring all gunshot wounds to be reported to law enforcement agencies. Fire fighting has some skills, prevention, self-preservation, rescue, preservation of property, basic first aid. Firefighting is further broken down into skills which include size-up, extinguishing, ventilation, salvage, wildland firefighting includes size up, containment, extinguishment, and mop up. Search and Rescue, which has already mentioned, is performed early in any fire scenario and many times is in unison with extinguishing. Fire suppression systems have a record for controlling and extinguishing unwanted fires. Many fire officials recommend that every building, including residences, have sprinkler systems. Correctly working sprinklers in a residence greatly reduce the risk of death from a fire, with the small rooms typical of a residence, one or two sprinklers can cover most rooms. Other methods of prevention are by directing efforts to reduce known hazardous conditions or by preventing dangerous acts before tragedy strikes. Tools are generally carried at all times and are important for not only forcible entry, a self-contained breathing apparatus delivers air to the firefighter through a full face mask and is worn to protect against smoke inhalation, toxic fumes, and super heated gases. The PASS device sounds an alarm that can assist another firefighter, Firefighters often carry personal self-rescue ropes

7.
Fire engine
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A fire engine is a vehicle designed primarily for firefighting operations. In addition, many fire departments/fire services often employ their vehicles for other uses including emergency medical services. The terms fire engine and fire truck are used interchangeably. The primary purposes of an engine include transporting firefighters to an incident scene, providing water with which to fight a fire. Many fire vehicles are based on standard vehicle models and they are normally fitted with audible and visual warnings, as well as communication equipment such as two-way radios and mobile computer technology. The standard fire engine is an apparatus designed primarily for firefighting operations, the tools carried on the fire engine will vary greatly based on many factors including the size of the department and what sort of terrain the department must handle. For example, departments located near bodies of water or rivers are likely to have some sort of water rescue equipment. Standard tools found on all fire engines include ladders, hydraulic rescue tools, floodlights, fire hose, fire extinguishers, self-contained breathing apparatus. The exact layout of what is carried on an engine is decided by the needs of the department, some fire engines have a fixed deluge gun, also known as a master stream, which directs a heavy stream of water to wherever the operator points it. An additional feature of engines are their preconnected hose lines, commonly referred to as preconnects, the preconnects are attached to the engines onboard water supply and allow firefighters to quickly mount an aggressive attack on the fire as soon as they arrive on scene. The name is derived from the fact that the ladder is mounted on a turntable on the back of a truck chassis. To increase its length, the ladder is telescopic, modern telescopic ladders are either hydraulic or pneumatic. These mechanical features allow the use of ladders which are longer, sturdier and they may also have pre-attached hoses or other equipment. A ladder can also be mounted behind the cab and this is sometimes called mid-ship and the arrangement allows a lower travel height for the truck, and also can be more stable in certain conditions. In some cases, there may also be a monitor at the top of the ladder for ease of use, other appliances may simply have a track-way which will hold a manually-run hose reel securely, and prevent it from falling to the ground. In the United States, a truck, also known as a tractor-drawn aerial, tiller ladder. Unlike a commercial semi, the trailer and tractor are permanently combined and it has two drivers, with separate steering wheels for front and rear wheels. One of the features of the tiller-truck is its enhanced maneuverability

8.
Akershus Fortress
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Akershus Fortress or Akershus Castle is a medieval castle that was built to protect Oslo, the capital of Norway. It has also used as a prison. It was constructed in response to the Norwegian nobleman, Earl Alv Erlingsson of Sarpsborg’s earlier attack on Oslo that occurred in 1287, in the aftermath of the attack, it became clear that the city’s existing defences weren’t effective and therefore, a stronger defensive centre was needed. The castle is mentioned in sources for the first time in 1300 in a letter from king Haakon to a church in Oslo. However, the letter does not mention how far the construction of the castle has progressed by then, the fortress has successfully survived all sieges, primarily by Swedish forces, including those by forces led by Charles XII in 1716. In the early 17th century, the fortress was modernized and remodelled under the reign of the active King Christian IV, and got the appearance of a renaissance castle. The fortress was first used in battle in 1308, when it was besieged by the Swedish duke Eric of Södermanland, the siege was eventually broken by a local Norwegian army in a battle. In 1449-1450 the castle was besieged again, this time by the Swedish king Karl Knutsson Bonde, the castle wasn’t besieged again until 1502 when Scottish soldiers in service of the Danish king besieged the castle in order to regain it from the hands of the Norwegian nobleman Knut Alysson. Akershus was besieged yet again in 1523, this time by Swedish soldiers but Oslo’s inhabitants burned down their houses in an attempt to drive them out, the king Christian II besieged the castle from 1531 to 1532 but the siege was lifted by forces from Danmark and Lübeck. After this siege the castle was improved and strengthened, the immediate proximity of the sea was a key feature, for naval power was a vital military force as the majority of Norwegian commerce in that period was by sea. The fortress was important for the capital, and therefore. Whoever controlled Akershus fortress ruled Norway, the fortress has never successfully been besieged by a foreign enemy. However it surrendered without combat to Nazi Germany in 1940 when the Norwegian government evacuated the capital in the face of the unprovoked German assault on Denmark, during World War II, several people were executed here by the German occupiers, including members of the Pelle group. The fortress was liberated on 11 May 1945, when it was handed over to Terje Rollem on behalf of the Norwegian resistance movement, after the war, eight Norwegian traitors who had been tried for war crimes and sentenced to death were also executed at the fortress. Among those executed were Vidkun Quisling and Siegfried Fehmer, Akershus has also been a prison, with a section of it known as The Slavery because the prisoners could be rented out for work in the city. It has housed many rebels and criminals through Norwegian history, particularly well-known people to have been imprisoned there include author Gjest Baardsen, and the similarly idealized thief Ole Høiland. Also, many early Norwegian socialists also spent time in the cells of Akershus, the prison was also a plot element in the film Fante-Anne. Following the 1852 Laestadian Sámi revolt in Guovdageaidnu, all men except the two leaders Aslak Hætta and Mons Somby ended up in Akershus Fortress – the women were imprisoned in Trondheim, many of the rebels died after a few years in captivity

9.
Oslo Bazaars
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Oslo Bazaars are located at Oslo Cathedral, along the streets Karl Johans gate and Dronningens gate in Oslo, Norway. The bazaars were constructed from 1841 onwards, the halls were designed in Romanesque Revival style by architect Christian Heinrich Grosch. They were originally built for butchers selling meat at the market place Stortorvet. Later when this proved insufficient, construction continued along the design in a semicircle east of the church. Today the bazaar halls are listed as a protected site

10.
Karl Johans gate
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Karl Johans gate is the main street of the city of Oslo, Norway. The street was named in honor of King Charles III John, Karl Johans gate is a composite of several older streets that used to be separate thoroughfares. The eastern section was part of Christian IVs original city near the surrounding the city. When the ramparts were removed to make way for Oslo Cathedral, the wider western section was built during the 1840s as an avenue connecting the newly erected Norwegian Royal Palace with the rest of the city. In 1852, it was named Karl Johans gate in honor of the deceased king. His equestrian statue, by sculptor Brynjulf Bergslien, was erected during 1875 in front of the Royal Palace. When the Norwegian parliament building was completed in 1866 at the junction of the two separate streets, the two streets were joined and the whole length was named Karl Johans gate. In its current route, it connects Oslo Central Station, the railroad station in Oslo. The route changes its direction and width slightly halfway between two points, at Egertorget, a square at the intersection of Karl Johans gate and Øvre Slottsgate. This is the highest point and, here, both ends of the street may be seen, the street is 1,020 metres long, in addition there are 300 metres of direct extensions, Palace Hill and Palace Place. Oslo Cathedrals lower end is surrounded by the Bazaar Market, which is integrated with the historic Fire Watch that served as Oslos main fire station from 1860 until 1939

11.
Census
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A census is the procedure of systematically acquiring and recording information about the members of a given population. It is a regularly occurring and official count of a particular population, the term is used mostly in connection with national population and housing censuses, other common censuses include agriculture, business, and traffic censuses. United Nations recommendations also cover census topics to be collected, official definitions, classifications, the word is of Latin origin, during the Roman Republic, the census was a list that kept track of all adult males fit for military service. Current administrative data systems allow for other approaches to enumeration with the level of detail but raise concerns about privacy. A census can be contrasted with sampling in which information is obtained only from a subset of a population, typically main population estimates are updated by such intercensal estimates. Modern census data are used for research, business marketing, and planning. Census counts are necessary to adjust samples to be representative of a population by weighting them as is common in opinion polling, similarly, stratification requires knowledge of the relative sizes of different population strata which can be derived from census enumerations. In some countries, the census provides the official used to apportion the number of elected representatives to regions. In many cases, a carefully chosen random sample can provide accurate information than attempts to get a population census. A census is often construed as the opposite of a sample as its intent is to count everyone in a rather than a fraction. However, population censuses rely on a frame to count the population. This is the way to be sure that everyone has been included as otherwise those not responding would not be followed up on. The fundamental premise of a census is that the population is not known, the use of a sampling frame is counterintuitive as it suggests that the population size is already known. However, a census is also used to collect data on the individuals in the nation. This process of sampling marks the difference between historical census, which was a house to house process or the product of a decree. The sampling frame used by census is almost always an address register, thus it is not known if there is anyone resident or how many people there are in each household. Depending on the mode of enumeration, a form is sent to the householder, as a preliminary to the dispatch of forms, census workers will check any address problems on the ground. While it may seem straightforward to use the postal service file for this purpose, a particular problem is what are termed communal establishments which category includes student residences, religious orders, homes for the elderly, people in prisons etc

12.
Livestock
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Livestock are domesticated animals raised in an agricultural setting to produce commodities such as food, fiber, and labor. The term is used to refer solely to those raised for food. In recent years, some organizations have also raised livestock to promote the survival of rare breeds, animal husbandry practices have varied widely across cultures and time periods. Originally, livestock were not confined by fences or enclosures, but these practices have largely shifted to intensive animal farming and these practices increase yield of the various commercial outputs, but have led to increased concerns about animal welfare and environmental impact. Livestock production continues to play an economic and cultural role in numerous rural communities. Livestock as a word was first used between 1650 and 1660, as a merger between the live and stock. Older English sources, such as the King James Version of the Bible, the word cattle is derived from Old North French catel, which meant all kinds of movable personal property, including livestock, which was differentiated from immovable real estate. In later English, sometimes smaller livestock such as chickens and pigs were referred to as small cattle, today, the modern meaning of cattle, without a modifier, usually refers to domesticated bovines, but sometimes livestock refers only to this subgroup. Legal definition United States federal legislation sometimes more narrowly defines the term to make specified agricultural commodities either eligible or ineligible for a program or activity, for example, the Livestock Mandatory Reporting Act of 1999 defines livestock only as cattle, swine, and sheep. Animal-rearing originated during the transition to settled farming communities from hunter-gatherer lifestyles. Animals are domesticated when their breeding and living conditions are controlled by humans, over time, the collective behaviour, lifecycle and physiology of livestock have changed radically. Many modern farm animals are unsuited to life in the wild, dogs were domesticated in East Asia about 15,000 years ago. Goats and sheep were domesticated around 8000 BC in Asia, swine or pigs were domesticated by 7000 BC in the Middle East and China. The earliest evidence of horse domestication dates to around 4000 BC, the term livestock is nebulous and may be defined narrowly or broadly. Broadly, livestock refers to any breed or population of animal kept by humans for a useful and this can mean domestic animals, semidomestic animals, or captive wild animals. Semidomesticated refers to animals which are only lightly domesticated or of disputed status and these populations may also be in the process of domestication. Some people may use the term livestock to refer to only used for red meat. Livestock are used by humans for a variety of purposes, many of which have an economic value, Livestock products include, Meat A useful form of dietary protein and energy, meat is the edible tissue of the animal carcass

13.
Water supply
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Water supply is the provision of water by public utilities commercial organisations, community endeavors or by individuals, usually via a system of pumps and pipes. However, about 14% did not have access to a water source and had to use unprotected wells or springs, canals. A clean water supply - in particular water that is not polluted with fecal matter from lack of sanitation - is the single most important determinant of public health. Destruction of water supply and/or sanitation infrastructure after major catastrophes poses the threat of severe epidemics of waterborne diseases. Water supply systems get water from a variety of locations after appropriate treatment, including groundwater, surface water, the water treatment steps include, in most cases, purification, disinfection through chlorination and sometimes fluoridation. Treated water then flows by gravity or is pumped to reservoirs. In the U. S, the single family home uses about 69.3 gallons of water per day. This includes toilet use, washing machine use, showers, baths, tap use, many of the 3.5 billion people having access to piped water receive a poor or very poor quality of service, especially in developing countries where about 80% of the world population lives. Water supply service quality has many dimensions, continuity, water quality, pressure, and it is estimated that about half of the population of developing countries receives water on an intermittent basis. Drinking water quality has a micro-biological and a physico-chemical dimension, there are thousands of parameters of water quality. For more details, please see the entries on water quality, water treatment. Water pressures vary in different locations of a distribution system, Water mains below the street may operate at higher pressures, with a pressure reducer located at each point where the water enters a building or a house. In poorly managed systems, water pressure can be so low as to only in a trickle of water or so high that it leads to damage to plumbing fixtures. Typical UK pressures are 4–5 bar for an urban supply, however, some people can get over eight bars or below one bar. A single iron main pipe may cross a valley, it will have the same nominal pressure. So people at the bottom of a 100-foot hill will get about 3 bars more than those at the top, the effective pressure also varies because of the pressure loss due to supply resistance even for the same static pressure. An urban consumer may have 5 metres of 15 mm pipe running from the main, so the kitchen tap flow will be fairly unrestricted. A rural consumer may have a kilometre of rusted and limed 22 mm iron pipe, for this reason, the UK domestic water system has traditionally employed a cistern feed system, where the incoming supply is connected to the kitchen sink and also a header/storage tank in the attic

14.
Dam
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A dam is a barrier that impounds water or underground streams. Reservoirs created by not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture. Hydropower is often used in conjunction with dams to generate electricity, a dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. The word dam can be traced back to Middle English, and before that, from Middle Dutch, the first known appearance of dam occurs in 1165. However, there is one village, Obdam, that is mentioned in 1120. The word seems to be related to the Greek word taphos, so the word should be understood as dike from dug out earth. The names of more than 40 places from the Middle Dutch era such as Amsterdam and Rotterdam, early dam building took place in Mesopotamia and the Middle East. Dams were used to control the level, for Mesopotamias weather affected the Tigris. The earliest known dam is the Jawa Dam in Jordan,100 kilometres northeast of the capital Amman and this gravity dam featured an originally 9-metre-high and 1 m-wide stone wall, supported by a 50 m-wide earth rampart. The structure is dated to 3000 BC, the Ancient Egyptian Sadd-el-Kafara Dam at Wadi Al-Garawi, located about 25 km south of Cairo, was 102 m long at its base and 87 m wide. The structure was built around 2800 or 2600 BC as a dam for flood control. During the Twelfth Dynasty in the 19th century BC, the Pharaohs Senosert III, Amenemhat III, two dams called Ha-Uar running east-west were built to retain water during the annual flood and then release it to surrounding lands. The lake called Mer-wer or Lake Moeris covered 1,700 km2 and is today as Berkat Qaroun. One of the wonders of the ancient world was the Great Dam of Marib in Yemen. Repairs were carried out during various periods, most important around 750 BC and these extensive works were not actually finalized until 325 AD and allowed the irrigation of 25,000 acres. By the mid-late 3rd century BC, an intricate water-management system within Dholavira in modern-day India was built, the system included 16 reservoirs, dams and various channels for collecting water and storing it. Eflatun Pınar is a Hittite dam and spring temple near Konya and it is thought to be from the time of the Hittite empire between the 15th and 13th century BC

15.
Maridalsvannet
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Maridalsvannet is a lake in Maridalen, Oslo, Norway. It is the largest lake in the municipitality of Oslo, the lake drains via the river Akerselva to the Oslofjord. The primary inflows are Skjærsjøelva and Dausjøelva, the Hammeren Hydroelectric Power Station exploits the fall from Skjærsjøen to Maridalsvannet

16.
Logging
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Logging is the cutting, skidding, on-site processing, and loading of trees or logs onto trucks or skeleton cars. In forestry, the logging is sometimes used in a narrow sense concerning the logistics of moving wood from the stump to somewhere outside the forest. However, in usage, the term may be used to indicate a range of forestry or silviculture activities. Illegal logging refers to what in forestry might be called timber theft by the timber mafia and it can also refer to the harvesting, transportation, purchase, or sale of timber in violation of laws. Clearcut logging is not necessarily considered a type of logging but a harvesting or silviculture method, in the forest products industry logging companies may be referred to as logging contractors, with the smaller, non-union crews referred to as gyppo loggers. Cutting trees with the highest value and leaving those with lower value and it is sometimes called selective logging, and confused with selection cutting, the practice of managing stands by harvesting a proportion of trees. Logging usually refers to above-ground forestry logging, submerged forests exist on land that has been flooded by damming to create reservoirs. Such trees are logged using underwater logging or by the lowering of the reservoirs in question, ootsa Lake and Williston Lake in British Columbia, Canada are notable examples where timber recovery has been needed to remove inundated forests. Clearcutting, or clearfelling, is a method of harvesting that removes all the standing trees in a selected area. Silviculture objectives for clearcutting, and a focus on forestry distinguish it from deforestation, other methods include shelterwood cutting, group selective, single selective, seed-tree cutting, patch cut, and retention cutting. The above operations can be carried out by different methods, of which the three are considered industrial methods, Trees are felled and then delimbed and topped at the stump. The log is then transported to the landing, where it is bucked and loaded on a truck and this leaves the slash in the cut area, where it must be further treated if wild land fires are of concern. This ability is due to the advancement in the style felling head that can be used, the trees are then delimbed, topped, and bucked at the landing. This method requires that slash be treated at the landing, in areas with access to cogeneration facilities, the slash can be chipped and used for the production of electricity or heat. Full-tree harvesting also refers to utilization of the tree including branches. Cut-to-length logging is the process of felling, delimbing, bucking, harvesters fell the tree, delimb, and buck it, and place the resulting logs in bunks to be brought to the landing by a skidder or forwarder. This method is available for trees up to 900 mm in diameter. Harvesters are employed effectively in level to steep terrain

17.
Cast iron
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Cast iron is a group of iron-carbon alloys with a carbon content greater than 2%. Its usefulness derives from its low melting temperature. Carbon ranging from 1. 8–4 wt%, and silicon 1–3 wt% are the main alloying elements of cast iron, Iron alloys with less carbon content are known as steel. While this technically makes the Fe–C–Si system ternary, the principle of cast iron solidification can be understood from the simpler binary iron–carbon phase diagram, cast iron tends to be brittle, except for malleable cast irons. It is resistant to destruction and weakening by oxidation, the earliest cast iron artefacts date to the 5th century BC, and were discovered by archaeologists in what is now Jiangsu in China. Cast iron was used in ancient China for warfare, agriculture, during the 15th century, cast iron became utilized for artillery in Burgundy, France, and in England during the Reformation. The first cast iron bridge was built during the 1770s by Abraham Darby III, cast iron is also used in the construction of buildings. Cast iron is made by re-melting pig iron, often along with quantities of iron, steel, limestone, carbon. Phosphorus and sulfur may be burnt out of the iron, but this also burns out the carbon. Depending on the application, carbon and silicon content are adjusted to the desired levels, other elements are then added to the melt before the final form is produced by casting. Cast iron is melted in a special type of blast furnace known as a cupola. After melting is complete, the molten cast iron is poured into a furnace or ladle. Cast irons properties are changed by adding various alloying elements, or alloyants, next to carbon, silicon is the most important alloyant because it forces carbon out of solution. A low percentage of silicon allows carbon to remain in solution forming iron carbide, a high percentage of silicon forces carbon out of solution forming graphite and the production of grey cast iron. Other alloying agents, manganese, chromium, molybdenum, titanium and vanadium counteracts silicon, promotes the retention of carbon, nickel and copper increase strength, and machinability, but do not change the amount of graphite formed. The carbon in the form of graphite results in an iron, reduces shrinkage, lowers strength. Sulfur, largely a contaminant when present, forms iron sulfide, the problem with sulfur is that it makes molten cast iron viscous, which causes defects. To counter the effects of sulfur, manganese is added because the two form into manganese sulfide instead of iron sulfide, the manganese sulfide is lighter than the melt so it tends to float out of the melt and into the slag

18.
Pump
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A pump is a device that moves fluids, or sometimes slurries, by mechanical action. Pumps can be classified into three groups according to the method they use to move the fluid, direct lift, displacement. Pumps operate by some mechanism, and consume energy to mechanical work by moving the fluid. Pumps operate via many energy sources, including operation, electricity, engines, or wind power, come in many sizes. Single stage pump - When in an only one impeller is revolving then it is called single stage pump. Double/ Multi stage pump - When in a two or more than two impellers are revolving then it is called double/ multi stage pump. In biology, many different types of chemical and bio-mechanical pumps have evolved, mechanical pumps may be submerged in the fluid they are pumping or be placed external to the fluid. Pumps can be classified by their method of displacement into positive displacement pumps, impulse pumps, velocity pumps, gravity pumps, steam pumps, there are two basic types of pumps, positive displacement and centrifugal. Although axial-flow pumps are classified as a separate type, they have essentially the same operating principles as centrifugal pumps. A positive displacement pump makes a move by trapping a fixed amount. Some positive displacement pumps use a cavity on the suction side. Liquid flows into the pump as the cavity on the suction side expands, the volume is constant through each cycle of operation. Positive displacement pumps, unlike centrifugal or roto-dynamic pumps, theoretically can produce the flow at a given speed no matter what the discharge pressure. Thus, positive displacement pumps are constant flow machines, however, a slight increase in internal leakage as the pressure increases prevents a truly constant flow rate. A positive displacement pump must not operate against a closed valve on the side of the pump. A relief or safety valve on the side of the positive displacement pump is therefore necessary. The relief valve can be internal or external, the pump manufacturer normally has the option to supply internal relief or safety valves. The internal valve is only used as a safety precaution

19.
Intersection (road)
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An intersection is an at-grade junction where two or more roads meet or cross. Intersections may be classified by number of segments, traffic controls. This article primarily reflects practice in jurisdictions where vehicles are driven on the right, if not otherwise specified, right and left can be reversed to reflect jurisdictions where vehicles are driven on the left. One way to classify intersections is by the number of segments that are involved. A three-way intersection is a junction between three segments, a T junction when two arms form one road, or a Y junction – the latter also known as a fork if approached from the stem of the Y. A four-way intersection, or crossroads, usually involves a crossing over of two streets or roads, in areas where there are blocks and in some other cases, the crossing streets or roads are perpendicular to each other. However, two roads may cross at a different angle, in a few cases, the junction of two road segments may be offset from each when reaching an intersection, even though both ends may be considered the same street. Five-way intersections are common but still exist, especially in urban areas with non-rectangular blocks. An example of this is the intersection for which the Five Points district in Atlanta is named, Seven or more approaches to a single intersection, such as at Seven Dials, London, are rare. Another way of classifying intersections is by traffic control technology, Uncontrolled intersections, for traffic coming from the same or opposite direction, that which goes straight has priority over that which turns off. Yield-controlled intersections may or may not have specific YIELD signs, stop-controlled intersections have one or more STOP signs. Two-way stops are common, while some countries also employ four-way stops, signal-controlled intersections depend on traffic signals, usually electric, which indicate which traffic is allowed to proceed at any particular time. A traffic circle is a type of intersection at which traffic streams are directed around a circle, types of traffic circles include roundabouts, mini-roundabouts, rotaries, STOP-controlled circles, and signal-controlled circles. Some people consider roundabouts to be a type of intersection from traffic circles. A box junction can be added to an intersection, generally prohibiting entry to the intersection unless the exit is clear, some intersections employ indirect left turns to increase capacity and reduce delays. The Michigan left combines a right turn and a U-turn, jughandle lefts diverge to the right, then curve to the left, converting a left turn to a crossing maneuver, similar to throughabouts. These techniques are used in conjunction with signal-controlled intersections, although they may also be used at stop-controlled intersections. A roundabout and its variants like turbo roundabouts, bowties and distributing circles like traffic circles, at intersections, turns are usually allowed, but often regulated to avoid interference with other traffic

20.
Tap water
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Tap water is water supplied to a tap. Its uses include drinking, washing, cooking, and the flushing of toilets, Tap water became common in many regions during the 20th century, and is now lacking mainly among people in poverty, especially in developing countries. Tap water is often assumed to be drinking water, especially in developed countries. Usually it is potable, although water quality problems are not rare, household water purification methods such as water filters, boiling, or distillation can be used when tap waters potability is doubted. The application of technologies involved in providing water to homes, businesses. Publicly available treated water has historically been associated with increases in life expectancy. Water-borne diseases are vastly reduced by proper sewage and fresh water availability, specific chemical compounds are often taken out of tap water during the treatment process to adjust the pH or remove contaminants, and chlorine may be added to kill biological toxins. Local geological conditions affecting groundwater are determining factors for the presence of metal ions. Tap water remains susceptible to biological or chemical contamination, in the event of contamination deemed dangerous to public health, government officials typically issue an advisory regarding water consumption. In the case of contamination, residents are usually advised to boil their water before consumption or to use bottled water as an alternative. In the case of contamination, residents may be advised to refrain from consuming tap water entirely until the matter is resolved. In many areas a compound of fluoride is added to tap water in an effort to improve health among the public. In some communities fluoridation remains a controversial issue and this supply may come from several possible sources. Municipal water supply Water wells Processed water from creeks, streams, rivers, lakes, rainwater, domestic water systems have been evolving since people first located their homes near a running water supply, such as a stream or river. The water flow also allowed sending waste water away from the residences, modern indoor plumbing delivers clean, safe, potable water to each service point in the distribution system. It is important that the water not be contaminated by the waste water side of the process system. Historically, this contamination of drinking water has been the largest killer of humans, Tap water can sometimes appear cloudy, often mistaken for mineral impurities in the water. It is usually caused by air coming out of solution due to change in temperature or pressure

21.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation